forked from mirrors/gecko-dev
124 lines
4.6 KiB
JavaScript
124 lines
4.6 KiB
JavaScript
/* Any copyright is dedicated to the Public Domain.
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http://creativecommons.org/publicdomain/zero/1.0/ */
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XPCOMUtils.defineLazyGetter(this, "docShell", () => {
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return window.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIWebNavigation)
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.QueryInterface(Ci.nsIDocShell);
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});
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const EXPECTED_REFLOWS = [
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// tabbrowser.adjustTabstrip() call after tabopen animation has finished
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"adjustTabstrip@chrome://browser/content/tabbrowser.xml|" +
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"_handleNewTab@chrome://browser/content/tabbrowser.xml|" +
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"onxbltransitionend@chrome://browser/content/tabbrowser.xml|",
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// switching focus in updateCurrentBrowser() causes reflows
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"updateCurrentBrowser@chrome://browser/content/tabbrowser.xml|" +
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"onselect@chrome://browser/content/browser.xul|",
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// switching focus in openLinkIn() causes reflows
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"openLinkIn@chrome://browser/content/utilityOverlay.js|" +
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"openUILinkIn@chrome://browser/content/utilityOverlay.js|" +
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"BrowserOpenTab@chrome://browser/content/browser.js|",
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// accessing element.scrollPosition in _fillTrailingGap() flushes layout
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"get_scrollPosition@chrome://global/content/bindings/scrollbox.xml|" +
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"_fillTrailingGap@chrome://browser/content/tabbrowser.xml|" +
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"_handleNewTab@chrome://browser/content/tabbrowser.xml|" +
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"onxbltransitionend@chrome://browser/content/tabbrowser.xml|",
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// The TabView iframe causes reflows in the parent document.
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"iQClass_height@chrome://browser/content/tabview.js|" +
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"GroupItem_getContentBounds@chrome://browser/content/tabview.js|" +
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"GroupItem_shouldStack@chrome://browser/content/tabview.js|" +
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"GroupItem_arrange@chrome://browser/content/tabview.js|" +
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"GroupItem_add@chrome://browser/content/tabview.js|" +
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"GroupItems_newTab@chrome://browser/content/tabview.js|" +
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"TabItem__reconnect@chrome://browser/content/tabview.js|" +
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"TabItem@chrome://browser/content/tabview.js|" +
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"TabItems_link@chrome://browser/content/tabview.js|" +
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"TabItems_init/this._eventListeners.open@chrome://browser/content/tabview.js|",
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// SessionStore.getWindowDimensions()
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"ssi_getWindowDimension@resource:///modules/sessionstore/SessionStore.jsm|" +
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"@resource:///modules/sessionstore/SessionStore.jsm|" +
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"ssi_updateWindowFeatures@resource:///modules/sessionstore/SessionStore.jsm|" +
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"ssi_collectWindowData@resource:///modules/sessionstore/SessionStore.jsm|",
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// tabPreviews.capture()
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"tabPreviews_capture@chrome://browser/content/browser.js|" +
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"tabPreviews_handleEvent/<@chrome://browser/content/browser.js|",
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// tabPreviews.capture()
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"tabPreviews_capture@chrome://browser/content/browser.js|" +
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"@chrome://browser/content/browser.js|"
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];
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const PREF_PRELOAD = "browser.newtab.preload";
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/*
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* This test ensures that there are no unexpected
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* uninterruptible reflows when opening new tabs.
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*/
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function test() {
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waitForExplicitFinish();
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Services.prefs.setBoolPref(PREF_PRELOAD, false);
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registerCleanupFunction(() => Services.prefs.clearUserPref(PREF_PRELOAD));
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// Add a reflow observer and open a new tab.
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docShell.addWeakReflowObserver(observer);
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BrowserOpenTab();
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// Wait until the tabopen animation has finished.
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waitForTransitionEnd(function () {
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// Remove reflow observer and clean up.
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docShell.removeWeakReflowObserver(observer);
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gBrowser.removeCurrentTab();
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finish();
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});
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}
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let observer = {
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reflow: function (start, end) {
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// Gather information about the current code path.
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let path = (new Error().stack).split("\n").slice(1).map(line => {
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return line.replace(/:\d+$/, "");
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}).join("|");
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let pathWithLineNumbers = (new Error().stack).split("\n").slice(1).join("|");
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// Stack trace is empty. Reflow was triggered by native code.
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if (path === "") {
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return;
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}
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// Check if this is an expected reflow.
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for (let stack of EXPECTED_REFLOWS) {
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if (path.startsWith(stack)) {
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ok(true, "expected uninterruptible reflow '" + stack + "'");
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return;
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}
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}
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ok(false, "unexpected uninterruptible reflow '" + pathWithLineNumbers + "'");
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},
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reflowInterruptible: function (start, end) {
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// We're not interested in interruptible reflows.
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},
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QueryInterface: XPCOMUtils.generateQI([Ci.nsIReflowObserver,
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Ci.nsISupportsWeakReference])
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};
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function waitForTransitionEnd(callback) {
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let tab = gBrowser.selectedTab;
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tab.addEventListener("transitionend", function onEnd(event) {
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if (event.propertyName === "max-width") {
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tab.removeEventListener("transitionend", onEnd);
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executeSoon(callback);
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}
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});
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}
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